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This abbreviation comes as a result of the International Telecommunication Union and the International Astronomical Union wanting to use the same abbreviation in all languages. The official abbreviation for Coordinated Universal Time is UTC. See the " Current number of leap seconds" section for the number of leap seconds inserted to date. Leap seconds are inserted as necessary to keep UTC within 0.9 seconds of the UT1 variant of universal time. The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by Earth's rotation. A decision whether to remove them altogether has been deferred until 2023. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT) and (c) standard signals should contain information on the difference between UTC and UT." Ī number of proposals have been made to replace UTC with a new system that would eliminate leap seconds. This change also adopted leap seconds to simplify future adjustments. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The coordination of time and frequency transmissions around the world began on 1 January 1960. It is effectively a successor to Greenwich Mean Time (GMT).
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It is within about 1 second of mean solar time at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) such as UT1 and is not adjusted for daylight saving time. The geographically correct position is about 100 meters further east.Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time.
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In the courtyard of the historic Royal Greenwich Observatory, a brass strip and a laser beam symbolise the zero meridian. Previously, numerous coordinate systems competed with each other. Only with this worldwide uniform regulation did the coordinates named to us today exist. When the date line was established in a preferably uninhabited area between Asia and America, the zero meridian was established on the opposite side of the globe in Greenwich. Each section of 15° corresponded to one hour, which, at least in theory, resulted in 24 uniformly large time zones.
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It was not until 1884 that a globally uniform time system was agreed upon, dividing the globe into 24 equally sized areas according to their longitudes. One of the best known was already based on the Greenwich meridian. Origin of the Greenwich Mean Time At seafaring times, there were different zero meridians and systems for position calculation depending on the nation. GMT is the name of the time zone, while UTC is rather a term for a time system that also has its normal state on the zero meridian. The different designation of the same time zone often leads to confusion. It essentially corresponds to Western European time, which is valid in Portugal, for example, but is officially referred to as GMT in the United Kingdom and several African countries. the Coordinated World Time with an offset of 0 hours. The Greenwich Mean Time corresponds to the time zone UTC 0, i.e. For Greenwich Mean Time, the time zone UTC +0 applies. Germany itself is in the time zone UTC +1. the time that exists on the zero meridian (zero longitude). GMT and UTC - Coordinated World Time The differences between the individual time zones are always given in relation to the "Universal Time Coordinated" (UTC), i.e. Saint Helena, Ascension and Tristan da Cunha